Performance Analysis for Cooperative Jamming and Artificial Noise Aided Secure Transmission Scheme in Vehicular Communication Network

Abstract Vehicular communication has emerged as a supporting technique for improving road traffic safety and efficiency in the intelligent transportation system (ITS). However, the wireless vehicular communication links may suffer from an eavesdropping threat due to the wireless broadcasting nature and high-mobility of vehicles. In practice, artificial noise (AN) assisted beamforming scheme can be utilized for fighting against multiple malicious eavesdroppers. Unfortunately, channel estimation errors caused by the high mobility of vehicles may lead to noise leakage at the legitimate receiver, thus resulting significant loss in the secrecy performance. In this paper, a joint cooperative jamming and AN aided secure transmission scheme is proposed in vehicular communication network by considering the imperfect channel state information(CSI). In this scheme, cooperative jammers are utilized for further enhancing physical layer security. We derive the closed-form expressions of the connection and secrecy outage probabilities in the presence of AN leakage and signal offset using a stochastic geometry approach. Furthermore, the proposed scheme is capable of maximizing the secrecy throughput in terms of relative vehicular velocity for balancing both the reliability and security of the legitimate link. We further comprehensively analyze the effect of key system parameters on secrecy performance through asymptotic analysis. Finally, the effectiveness of the proposed scheme is validated by numerical results.